$$\frac{ 1 }{ 4 } - \frac{ 1 }{ 2 } + \frac{ 1 }{ 1 }$$
$\frac{3}{4}=0.75$
$$\frac{1}{4}-\frac{1}{2}+1$$
$$\frac{1}{4}-\frac{2}{4}+1$$
$$\frac{1-2}{4}+1$$
$$-\frac{1}{4}+1$$
$$-\frac{1}{4}+\frac{4}{4}$$
$$\frac{-1+4}{4}$$
$$\frac{3}{4}$$
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$\frac{3}{2 ^ {2}} = 0.75$
